Exhaust Gas Temperature Sensor Circuit Bank 1 Sensor 2
P2031 indicates a circuit malfunction with the Exhaust Gas Temperature (EGT) sensor on Bank 1, Sensor 2. This sensor monitors exhaust temperature to optimize fuel injection and emission control, and a circuit fault prevents the engine computer from reading accurate temperature data.
What You Might Notice
- Check Engine Light illuminated
- Possible rough idle or hesitation
- Reduced fuel economy
- Increased emissions
- No obvious drivability issues in many cases
Most Common Causes
- 1
Loose or corroded connectors
Corroded or loose connector terminals at the EGT sensor are the most common cause, preventing proper signal transmission to the engine computer.
- 2
Damaged sensor wiring
Broken wires, damaged insulation, or shorts to ground in the EGT sensor circuit harness can prevent signal transmission.
- 3
Failed EGT sensor
The EGT sensor itself may have reached end of life or suffered internal failure, no longer generating accurate temperature signals.
- 4
Engine control module failure
Though rare, the PCM/ECU may have failed in its ability to process the EGT sensor signal correctly.
How to Diagnose It
- 1
Check Loose or corroded connectors — Corroded or loose connector terminals at the EGT sensor are the most common cause, preventing proper signal transmission to the engine computer.
- 2
Check Damaged sensor wiring — Broken wires, damaged insulation, or shorts to ground in the EGT sensor circuit harness can prevent signal transmission.
- 3
Check Failed EGT sensor — The EGT sensor itself may have reached end of life or suffered internal failure, no longer generating accurate temperature signals.
- 4
Check Engine control module failure — Though rare, the PCM/ECU may have failed in its ability to process the EGT sensor signal correctly.
How to Fix It
- 1
Inspect and clean connectors
Locate the EGT sensor connector on Bank 1, Sensor 2 and inspect for corrosion, loose pins, or debris. Clean with electrical contact cleaner and reseat firmly.
- 2
Check wiring harness
Inspect the entire EGT sensor wiring harness from the sensor to the engine computer for breaks, cuts, pinches, or signs of heat damage. Repair or replace damaged sections.
- 3
Replace EGT sensor
If connectors and wiring are intact, the EGT sensor has likely failed and should be replaced. Remove the old sensor from the exhaust manifold and install the new one.
- 4
Verify PCM function
If all sensors and wiring test good, perform PCM diagnostics or have the module tested by a professional to rule out internal computer failure.
Need a deeper diagnosis?
Search for related repair guides or browse by system.